Eminently suitable for preformed ponds, the Velda Plant Sock has a very finely-woven structure and is very strong, as a result of which the roots of the pond plants can not start growing rank and the pond soil will not flush away. The Plant Sock is suitable for all kinds of pond plants. Owing to the flexibility of the woven material the sock can be placed on almost any base. Through their leaves and roots pond plants remove harmful waste materials from the water. They produce oxygen and keep the pond clear and healthy. Each group of pond plants makes specific demands on the soil in which it has been planted.